Herlambang, A. D., L. Akhmadi, and S. H. Wijoyo. “Interactive Digital Book Development for Computer and Network Fundamental Teaching Subject Based on Four - D Model at Indonesian Computer and Network Engineering Vocational High School”. Journal of Information Technology and Computer Science, vol. 4, no. 2, Sept. 2019, pp. 156-65, doi:10.25126/jitecs.201942118.